Composite geomembrane for high-speed railway roadbed

A composite geomembrane, high-speed railway technology, applied in roads, buildings, tracks, etc., can solve problems such as affecting the stability and service life of railway subgrades, difficult to adapt to the complex environment along the railway, easy to be blocked by gravel and lateral drainage capacity, etc. Achieve excellent lateral drainage performance, excellent acid and alkali resistance, and prevent the phenomenon of turning mud and slurry.

Pending Publication Date: 2019-06-25
CHINA RAILWAY ERYUAN ENG GRP CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The phenomenon of muddying in the subgrade bed is a common disease of railway subgrades in my country. The use of composite geomembranes to prevent muddying of the subgrade bed has been widely used. At present, polyester composite geomembranes are mainly used, but because polyester geotextiles It has weak acid and alkali resistance and poor corrosion resistance, so it is difficult to adapt to the complex environment along the railway,

Method used

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  • Composite geomembrane for high-speed railway roadbed

Examples

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Effect test

Embodiment 1

[0019] The weight of the upper polypropylene filament composite geotextile 10 is 150g / m 2 , including an upper layer of fine polypropylene filament geotextile 11 and a lower layer of coarse polypropylene filament geotextile 12. Wherein the grammage of upper fine polypropylene filament geotextile 11 is 50g / m 2 , The fiber fineness is 5D, and the weight of the lower coarse polypropylene filament geotextile 12 is 100g / m 2 , The fiber fineness is 11D. The upper layer of fine polypropylene filament geotextile 11 and the lower layer of coarse polypropylene filament geotextile 12 are produced by a spunbond production line device, and then stacked together and consolidated into one body through a needle punching process. The average longitudinal and transverse tensile strength of the upper polypropylene filament composite geotextile 10 is 9.5kN / m, the tear strength is 523.6N, the CBR bursting strength is 1870N, and the in-plane water permeability is 7.8l / m.h.

[0020] The polyethyl...

Embodiment 2

[0024] The weight of the upper polypropylene filament composite geotextile 10 is 200g / m 2 , including an upper layer of fine polypropylene filament geotextile 11 and a lower layer of coarse polypropylene filament geotextile 12. Wherein the grammage of upper fine polypropylene filament geotextile 11 is 50g / m 2 , The fiber fineness is 5D, and the weight of the lower coarse polypropylene filament geotextile 12 is 150g / m 2 , The fiber fineness is 11D. The upper layer of fine polypropylene filament geotextile 11 and the lower layer of coarse polypropylene filament geotextile 12 are produced by a spunbond production line device, and then stacked together and consolidated into one body through a needle punching process. The average longitudinal and transverse tensile strength of the upper polypropylene filament composite geotextile 10 is 12.1kN / m, the tear strength is 673N, the CBR bursting strength is 2398N, and the in-plane water permeability is 11.8l / m.h.

[0025] The polyethyl...

Embodiment 3

[0029] The weight of the upper polypropylene filament composite geotextile 10 is 200g / m 2 , including an upper layer of fine polypropylene filament geotextile 11 and a lower layer of coarse polypropylene filament geotextile 12. Wherein the grammage of upper fine polypropylene filament geotextile 11 is 50g / m 2 , The fiber fineness is 5D, and the weight of the lower coarse polypropylene filament geotextile 12 is 150g / m 2, The fiber fineness is 11D. The upper layer of fine polypropylene filament geotextile 11 and the lower layer of coarse polypropylene filament geotextile 12 are produced by a spunbond production line device, and then stacked together and consolidated into one body through a needle punching process. The average longitudinal and transverse tensile strength of the upper polypropylene filament composite geotextile 10 is 12.1kN / m, the tear strength is 673N, the CBR bursting strength is 2398N, and the in-plane water permeability is 11.8l / m.h.

[0030] The polyethyle...

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Abstract

The invention provides a composite geomembrane for a high-speed railway roadbed. The corrosion resistance and freeze-thawing resistance of the composite geomembrane are effectively improved, so that the geomembrane has good drainage performance, and the use stability of the geomembrane is remarkably improved. The composite geomembrane is formed by compounding an upper polypropylene filament composite geotechnical cloth, a middle layer polyethylene or polyvinyl chloride composite geomembrane and a lower polypropylene filament needled geotechnical cloth which are sequentially stacked from top tobottom. The upper layer polypropylene filament composite geotechnical cloth is formed by compounding an upper layer fine polypropylene filament geotechnical cloth and a lower layer thick polypropylene filament geotechnical cloth, and the gram weight is 150-300 g/m<2>, wherein the gram weight of the upper layer fine polypropylene filament geotechnical cloth is 50-150 g/m<2>, the fiber fineness is5-7 D, the gram weight of the lower layer thick polypropylene filament geotechnical cloth is 75-250 g/m<2>, and the fiber fineness is 9-15 D.

Description

technical field [0001] The invention belongs to the technical fields of construction engineering and civil engineering waterproofing, and in particular relates to a composite geomembrane for high-speed railway subgrades. Background technique [0002] The phenomenon of muddying in the subgrade bed is a common disease of railway subgrades in my country. The use of composite geomembranes to prevent muddying of the subgrade bed has been widely used. At present, polyester composite geomembranes are mainly used, but because polyester geotextiles It has weak acid and alkali resistance and poor corrosion resistance, so it is difficult to adapt to the complex environment along the railway, especially in the environment of high cold, high salinity and alkali, etc., it is easy to corrode and lose its strength. Moreover, during the long-term use of the existing composite geomembrane, the upper geotextile structure is easily blocked by sand and gravel, which greatly reduces the lateral dr...

Claims

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Application Information

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IPC IPC(8): E01B2/00
Inventor 吴沛沛镇垒李洪昌王开云曾永红胡超胡会星
Owner CHINA RAILWAY ERYUAN ENG GRP CO LTD
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